diff --git a/radio/src/targets/common/arm/CMakeLists.txt b/radio/src/targets/common/arm/CMakeLists.txt
index b1ea6469f..57e389b6f 100644
--- a/radio/src/targets/common/arm/CMakeLists.txt
+++ b/radio/src/targets/common/arm/CMakeLists.txt
@@ -67,14 +67,9 @@ if(DEFAULT_INTERNAL_MODULE)
 endif()
 
 if(HARDWARE_EXTERNAL_MODULE)
-  set(TARGET_SRC
-    ${TARGET_SRC}
-    extmodule_driver.cpp
-    )
   add_definitions(-DHARDWARE_EXTERNAL_MODULE)
 endif()
 
-
 if(TIMERS EQUAL 3)
   add_definitions(-DTIMERS=3)
 else()
diff --git a/radio/src/targets/horus/CMakeLists.txt b/radio/src/targets/horus/CMakeLists.txt
index ad2a310b3..8f2040c8e 100644
--- a/radio/src/targets/horus/CMakeLists.txt
+++ b/radio/src/targets/horus/CMakeLists.txt
@@ -166,6 +166,10 @@ set(RADIO_DEPENDENCIES
   truetype_fonts
   )
 
+if(HARDWARE_EXTERNAL_MODULE)
+  set(TARGET_SRC ${TARGET_SRC} extmodule_driver.cpp)
+endif()
+
 set(FIRMWARE_DEPENDENCIES datacopy)
 
 add_definitions(-DPCBHORUS -DSTM32F429_439xx -DSDRAM -DCCMRAM -DCOLORLCD -DHARDWARE_KEYS)
diff --git a/radio/src/targets/taranis/CMakeLists.txt b/radio/src/targets/taranis/CMakeLists.txt
index fb36982f5..dc67b83dd 100644
--- a/radio/src/targets/taranis/CMakeLists.txt
+++ b/radio/src/targets/taranis/CMakeLists.txt
@@ -383,6 +383,10 @@ else()
     )
 endif()
 
+if(HARDWARE_EXTERNAL_MODULE)
+  set(TARGET_SRC ${TARGET_SRC} extmodule_driver.cpp)
+endif()
+
 if(ROTARY_ENCODER)
   set(TARGET_SRC
     ${TARGET_SRC}